Here is my 1970 SCHWINN HEAVY-DUTI BICYCLE, This was an Estate Auction Purchase. The bike is in near mint condition. I looked up the serial number and it shows that bicycle was made in October 1970.
Has the original TRACTOR TIRES that these came with. Has the Schwinn speedometer/odometer which shows 108 miles, which I think is original as the condition shows. Has the spring front and what looks like a gas tank (fantasy), also a headlight. If anyone knows more about these bikes, please let me know.